from rest_framework.views import exception_handler

from django.db import DatabaseError
from rest_framework.response import Response
from rest_framework import status

import logging
logger = logging.getLogger('django')    # 对应日志配置文件的名字


def custom_exception_handler(exc, context):
    """
    自定义异常处理
    :param exc: 异常类
    :param context: 抛出异常的上下文
    :return: Response响应对象
    """
    # 调用drf框架原生的异常处理方法
    response = exception_handler(exc, context)

    if response is None:  # 判断异常是否为空(异常有可能是drf原生无法判断的,需要自己重新写异常判断)
        view = context['view']  # 从context拿到当前报错的视图
        if isinstance(exc, DatabaseError):
            # 数据库异常
            logger.error('[%s] %s' % (view, exc))  # 记录日志
            response = Response({'message': '服务器内部错误'}, status=status.HTTP_507_INSUFFICIENT_STORAGE)

    return response
